Re: [BUG] checkpatch warning default switch case
From: Joe Perches
Date: Fri Dec 11 2015 - 20:35:04 EST
On Fri, 2015-12-11 at 18:56 -0300, Geyslan G. Bem wrote:
> 2015-12-11 17:21 GMT-03:00 Geyslan G. Bem <geyslan@xxxxxxxxx>:
> > 2015-12-11 17:08 GMT-03:00 Joe Perches <joe@xxxxxxxxxxx>:
> > > On Fri, 2015-12-11 at 16:34 -0300, Geyslan G. Bem wrote:
> > > > Hello,
> > > >
> > > > Running
> > > > scripts/checkpatch.pl -f drivers/usb/host/ehci-sched.c
> > > >
> > > > I got this
> > > > ...
> > > > ERROR: spaces required around that ':' (ctx:VxE)
> > > > #496: FILE: drivers/usb/host/ehci-sched.c:496:
> > > > + default:
> > > > ...
> > > >
> > > >
> > > > 496: default:
> > > > ehci_dbg (ehci,
> > > > "periodic frame %d bogus type
> > > > %d\n",
> > > > frame, type);
> > > > }
> > > >
> > > > It seems a correct use of default switch case. Maybe the test
> > > > concerns
> > > > to ternary conditional.
> > > >
> > > > Let me know.
> > >
> > > Yes, it's a checkpatch defect.
> > >
> > > It's because a c99 style comment is immediately before this line.
> > >
> > > switch (foo) {
> > > case 1:
> > > break;
> > > // foo
> > > default:
> > > break;
> > > }
> > >
> > > emits this ERROR
> > >
> > > I suggest you fix the comment and the message will go away.
> > Ok, I'm fixing it.
> >
> > Tks.
> > >
> > > Andy? Do you care to fix this defect?
> > >
> >
>
> Another false positive:
>
> WARNING: braces {} are not necessary for single statement blocks
> #1570: FILE: drivers/usb/host/ehci-sched.c:1570:
> + else {
> + start = (stream->ps.phase << 3) +
> stream->ps.phase_uf;
> + }
>
> The code:
>
> if (stream->ps.phase == NO_FRAME) {
> int done = 0;
> ...
> reserve_release_iso_bandwidth(ehci, stream, 1);
> }
>
> /* New stream is already scheduled; use the upcoming slot */
> else {
> start = (stream->ps.phase << 3) + stream->ps.phase_uf;
> }
>
> There's a C89 comment before the else branch and immediately before
> that an empty line. They, I think, are confusing the parser.
checkpatch isn't a real parser
Move the comment into the else block
if (...) {
...;
} else {
/* New stream ... */
start = ...;
}
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